Question

2) O broba de glucoza C6H12O6 contine 2x10la puterea 22 atomi de carbon.Determina :
a) Numarul de atomi de hidrogen pe care ii contine proba
b) Numarul de molecule de glucoza ce se afla in aceasta proba.

Answer 1

1 mol glucoza contine 6x6,022x10la23 atomi C si 12x6,022x10la23 atomi H

=> daca la 6x6,022x10la23 at C................... 1 mol glucoza

la 6x2x10la22 at. C ........................ n moli

=> n = 2×10la22/6,022×10la23 = 0,0332 moli glucoza

=> la 0,0332 moli glucoza vom avea ............ a at H

daca la 1 mol glucoza am............................. 12x6,022x10la23 at H

=> a = 2,4×10la23 at H

b) niu = N / N.a => N = niuxN.a = 0.03326,022×10la23 =2×10la22